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Transducer Range Charts

The tables in this section list some typical materials and thickness ranges that can be measured with ultrasonic gages, using specific transducers and appropriate instrument setups. These tables are intended only as a general guideline, and list only some of the most common applications for metals and plastics. There are many more possibilities. If you need information regarding a specific thickness measurement that is not listed here, please contact Olympus NDT.

All thickness ranges are approximate. The actual measurement range in a given case will always depend on instrument setup as well as specific material properties such as part geometry, surface condition, and microstructure. Material is assumed to be at ambient temperature. In all materials, attenuation increases with temperature, so at elevated temperatures the maximum measureable thickness will normally be lower, especially in plastics.

(1) English units

Notes: All thickness ranges are approximate. The actual measurement range in a given case will always depend on instrument setup as well as specific material properties such as part geometry, surface condition, and microstructure. The maximum thickness in plastics in Mode 1 measurements will vary depending on the type of plastic, so only a minimum is listed. These charts cover only some of the most common transducers and measurement situations. There are many other possibilities. For details, please contact Olympus NDT.

Transducer (frequency, diameter, type)	Measurement Mode	Range (metal)	Range (plastic)
20 MHz, 0.125" contact	1	0.020"-1.5"	0.008" minimum
10 MHz, 0.25" contact	1	0.030"-10"	0.010" minimum
5 MHz, 0.5" contact	1	0.050-20"	0.025" minimum
2.25 MHz, 0.5 contact	1	0.080"-20"	0.050" minimum
1 MHz, 1" contact	1	0.150"-25"	0.100" minimum
0.5 MHz, 1"	1	0.250"-25"	0.200" minimum
20 MHz, 0.125" delay line	2	0.010"- 0.400"	0.005" - 0.200"
20 MHz, 0.125" delay line	3	0.008"-0.200"	-
10 MHz, 0.25" delay line	2	0.020"-0.750"	0.012"-0.250"
10 MHz, 0.25" delay line	3	0.010"-0.500"	-
5 MHz, 0.5" delay line	2	0.050"-1.00"	0.040"-0.500"
5 MHz, 0.5" delay line	3	0.050"-0.500"	-
2.25 MHz, 0.5" delay line	2	0.080"-1.00"	0.060"-0.500"
2.25 MHz, 0.5" delay line	3	0.060"-0.500"	-
10 MHz, 0.3" dual	dual	0.020"-1.00"	-
5 MHz, 0.4" dual	dual	0.040"- 20"	-
2 MHz, 1.0" dual	dual	0.150"-25"	-

(2) Metric units

Transducer (frequency, diameter, type)	Measurement Mode	Range (metal)	Range (plastic)
20 MHz, 3 mm contact	1	0.05 -40 mm	0.2 mm minimum
10 MHz, 6.25mm contact	1	0.75-250 mm	0.25 mm minimum
5 MHz, 12.5mm contact	1	1.25-500 mm	0.6 mm minimum
2.25 MHz, 12.5mm contact	1	2.0-500 mm	1.25 mm minimum
1 MHz, 25 mm contact	1	3.75-650 mm	2.5 mm minimum
0.5 MHz, 25 mm contact	1	6.0"-650 mm	5.0 mm minimum
20 MHz, 3 mm delay line	2	0.25 - 10.0 mm	0.125 - 5.0 mm
20 MHz, 3 mm delay line	3	0.2 - 5.0 mm	-
10 MHz, 6.25 mm delay line	2	0.5 - 20 mm	0.3 - 6.25 mm
10 MHz, 6.25 mm delay line	3	0.25 - 12.5 mm	-
5 MHz, 12.5 mm delay line	2	1.25 - 25.0 mm	1.0 - 12.5 mm
5 MHz, 12.5 mm delay line	3	1.25 - 12.5 mm	-
2.25 MHz, 12.5 mm delay line	2	2.0 - 25.0 mm	1.5 - 25.0 mm
2.25 MHz, 12.5 mm delay line	3	1.5 - 12.5 mm	-
10 MHz, 7 mm dual	dual	0.5 - 25.0 mm	-
5 MHz, 10 mm dual	dual	1.0 - 500 mm	-
2 MHz, 25 mm dual	dual	3.75 - 635 mm	-